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New study explores unique approach to treat a rare liver disease

Written by Louise Stanley on . Posted in Clinical trials, Experimental medicine.

A UK research study looking into a new approach to treat primary sclerosing cholangitis (PSC), a rare disease where the body’s immune attacks its own liver, has been given the green light thanks to vital funding from LifeArc and the patient-led organisation PSC Support.

The FARGO trial, led by Dr Palak Trivedi at the University of Birmingham, will find out if a new treatment can slow PSC progression and improve quality of life for patients.

What is PSC?

PSC is a rare liver disease which affects around 3,600 people in the UK. People can develop the condition at any age, but most commonly those under the age of 40.

In PSC, the body’s immune system attacks the liver, causing inflammation and scarring of the bile ducts. This causes bile to stop flowing properly, and patients experience repeated infections, develop liver failure and, in some cases, cancer. In four out of five people, the body’s immune system will also attack the bowel, leading to inflammatory bowel disease (IBD) as well as liver disease. The combination of PSC and IBD can lead to around a third of all patients developing bowel cancer and patients require a colonoscopy every year to screen for it.

Currently, doctors treat PSC by managing symptoms only. We don’t fully understand what causes PSC, and there is no cure. A liver transplant is the only life-saving treatment. Although a very rare disease, PSC accounts for 1 in 10 of all liver transplants in the UK and is now the leading reason for liver transplantation in several European countries.

While it is life saving, liver transplantation is also risky and costly to the NHS. People who have had a transplant must take a cocktail of drugs to prevent their new liver being rejected. PSC can still return in around a third of people who have had a liver transplant.

Imbalance of gut microorganisms – and a new approach

We know that the microbes present in the gut of people with PSC are different to those in people without liver and bowel inflammation. This gut microbe imbalance is linked with many abnormal immune functions, which may drive development of the condition.

In the FARGO study, the research team will find out if taking stools containing natural microbes from the gut of healthy donors, refining it in a lab, and transferring it to the bowel of people with PSC, could reverse the imbalance of gut microorganisms. This treatment is called faecal microbiota transplantation, or FMT. Early research has also shown that it can treat IBD.

Bespoke clinical trial

The Birmingham team, together with teams at the Royal Free London, St Mark’s Hospital, Imperial College London, and Norfolk and Norwich University Hospitals NHS Foundation Trust, will carry out a clinical trial to test this new treatment approach. People with PSC taking part in the study will receive either FMT once a week for eight weeks, or placebo (an inactive FMT equivalent). Each group will continue to receive their usual routine standard of care for their IBD.

The teams will observe both groups for another 40 weeks. The team will then measure how successful the treatment has been in improving liver blood tests, reduce scarring of the liver, lessen the severity of their IBD, and improving symptoms and quality of life.

Dr Palak, who is leading the trial at the NIHR Birmingham Biomedical Research Centre, said: “I am delighted that LifeArc has chosen to support such a novel, bespoke and distinctive clinical trial, and to enable us to the necessary ground work needed to better understand how PSC develops and progresses.

“This study will really help us to understand which gut microbes are most important, and how this potential treatment could be scaled up to treat more people.

“Our study will lay the foundation for future work on a larger scale, with a view to making FMT available across the world.

“Should our trial show that FMT works well, PSC Support will be advocating for patients to access FMT as early as possible. We hope this means it will be making a difference to patients within five years after we’ve completed this work.”

LifeArc’s Dr Catriona Crombie said: “Our approach to funding is to work with others, to uncover the potential of promising research that could solve complex healthcare problems that patients face.”

She continued: “We’re delighted to be jointly funding this project with PSC Support, where Dr Trivedi’s team aim to reveal more information about PSC and help to translate this experimental treatment, from lab idea towards the clinic, where it could offer hope to patients with PSC.”

Martine Walmsley, Chair of Trustees at PSC Support, said: “Although we welcome clinical trials that test brand new drugs for PSC, progress is painfully slow. People with PSC don’t have the luxury of time and we must look at quicker medicine development routes.”

New blood cancer gene defect can be treated with existing drugs

Written by Louise Stanley on . Posted in Cancer outcomes, Experimental medicine.

A defective gene normally found in blood cancers could be treated with drugs already available for cancers with similar gene defects, scientists at BHP founder-member the University of Birmingham and Queen’s University Belfast have revealed.

The research team, funded mainly by Cancer Research UK and the Medical Research Council, found that tumours with mutations in the SF3B1 gene respond to PARP inhibitors – a type of drug used to treat cancers which have similar mutations in the BRCA1 and BRCA2 genes.

The researchers believe that PARP inhibitors could be used to treat patients with tumours carrying the defective SF3B1 gene. This mutation is most often found in blood cancers, including chronic lymphocytic leukaemia, as well as some rare cancers like uveal melanoma.

Co-author Professor Grant Stewart, of the University of Birmingham, said: “Our work demonstrates that a molecular understanding of how a specific gene mutation affects a cancer cell’s ability to repair damaged DNA can be exploited clinically to specifically tailor the anti-cancer therapy used to treat an individual’s tumour. This will increase the effectiveness of the therapy and hopefully, reduce the chances of re-occurrence.”

Dr Kienan Savage, lead author and Reader at Queen’s University Belfast, said: “Our findings have clinical implications for the treatment of many cancers. We specifically focused on this genetic mutation as it is found in several difficult to treat leukaemias and other cancers, and it affects so many cancer patients. By deepening our understanding of this gene mutation, we have identified new ways of treating these cancers that could improve survival rates.”

PARP inhibitors, which include olaparib and rucaparib, are used to treat some patients with ovarian, breast, prostate and pancreatic cancers – usually patients who have inherited a faulty BRCA1 or BRCA2 gene. Around 1 in 400 people have a faulty BRCA1 or BRCA2 gene.

The research – published in Cancer Research, a journal of the American Association for Cancer Research – found that the SF3B1 mutation produces similar effects to the faulty BRCA1 gene by damaging DNA, preventing it from being repaired properly, and stopping it from making normal copies of itself. PARP inhibitors target the cell’s DNA repair tools by locking them in place on the DNA. This stops DNA repair, causing the cancer cells to die.

The scientists found that cancer cells with the SF3B1 mutation were sensitive to olaparib, the most common PARP inhibitor, some specific chemotherapies and to radiotherapy. The scientists believe that the SF3B1 mutation disrupts the cell’s ability to make DNA repair proteins, leaving it vulnerable to drugs which target these proteins.

The SF3B1 mutation occurs in up to 30% of blood cancers called myelodysplastic syndromes, where blood cells don’t form properly. They are difficult to treat as they occur predominantly in older patients who may not be considered fit for treatment. The mutation is also common among uveal melanoma or cancers of the eye, which currently have limited treatment options.

Dr Katrina Lappin, of Queen’s Univesity Belfast and first author of the study, added: “Our research shows that cancers with these specific mutations, may be treated effectively with PARP inhibitor therapy drugs, which are less toxic, better at killing cancer cells with these mutations and can be taken at home in tablet form. This could have huge implications for improving outcomes and quality of life of people with these cancers. This work will pave the way for clinical trials using PARP inhibitors for the treatment of patients with this commonly associated cancer mutation, allowing a more personalised approach to the treatment of these cancers.”

The researchers now want to test PARP inhibitors in clinical trials with patients who have the SF3B1 mutation to see if they can stop their cancer from spreading.

Michelle Mitchell, Chief Executive of Cancer Research UK, said: “Our scientists helped to discover the BRCA gene over 25 years ago and since then we’ve led the way in developing PARP inhibitors to treat cancers with BRCA gene faults. It’s really exciting to hear about a new mutation, which behaves like the BRCA1 mutation and could in the future be treated in the same way. With PARP inhibitors already widely available, there is huge potential to help people with some of the rarest and most difficult-to-treat cancers known to us. Over the past two decades, PARP inhibitors have saved thousands of lives worldwide, and it will be interesting to see if this research in the future could lead to a similar impact for people with rarer cancers.”

The research was funded by the UK Medical Research Council, Cancer Research UK, Blood Cancer UK, Leukaemia and Lymphoma NI and Great Ormond Street Hospital Children’s Charity.

Triple-drug combo could prove key weapon in fight against cancer

Written by Louise Stanley on . Posted in Cancer outcomes, Clinical trials, Experimental medicine.

Combining three existing drugs – a commonly-used anti-epileptic, a contraceptive steroid and a cholesterol-lowering agent – could form an effective and non-toxic treatment for a range of aggressive blood cancers, a new study reveals.

The discovery by University of Birmingham scientists has led to a £1 million funding award from Blood Cancer UK to run a randomised clinical trial to test the new drug combo against another experimental agent (Danazol) in patients living with Myelodysplastic Syndromes (MDS).

Over 7,000 people in the UK have MDS and many patients die because their disease transforms into acute myeloid leukaemia (AML) – an even more aggressive blood cancer. The general outlook for AML is poor, but when AML arises from MDS it is worse.

Left untreated, AML kills patients quickly by crippling production of normal blood cells. AML is most prevalent in elderly people – many of whom cannot tolerate ‘traditional’ treatment of intensive chemotherapy because of their age and frailty.

Scientists at the University of Birmingham had already discovered that mixing bezafibrate (BEZ – cholesterol-lowering) with medroxyprogesterone acetate (MPA – contraceptive steroid) eased a range of blood cancers including AML, chronic lymphocytic leukaemia (CLL) and non-Hodgkins lymphoma.

Now clinical trials show that adding valproic acid to a low-dose combination of the other two drugs offers enhanced killing of AML cells – giving the low-dose triple-drug combo (VBaP) a cancer-busting impact similar to a high dose of BEZ and MPA (BaP).

Researchers from the University of Birmingham have published their findings in British Journal of Cancer.

Co-author Professor Chris Bunce, commented: Using existing drugs to treat conditions outside of their approved indications is a proven approach to generate effective low-toxicity therapies. We believe that treating patients earlier with low toxicity therapies is the most effective clinical strategy for improving patient outcomes.”

Earlier clinical trials had shown that low-doses of BaP given to patients who could not have chemotherapy produced no toxic side effects and helped patients to boost their production of blood cells.

However high doses of the dual combo were not well tolerated, due to the frail nature of the patients caused by their age, poor kidney function, disease and, in some cases, prior chemotherapy treatments.

Co-author Dr Farhat Khanim commented: “A major challenge in our previous BaP trials has been the focus on elderly patients for whom more intensive therapies were not option.

“For many of these patients there are very few treatment options other than regular transfusions to combat life-threatening deficits in red cells and platelets and antibiotic control of frequent life threatening infections.

“It is therefore an attractive option to consider testing VBaP in MDS patients. As the drug combination may have profound impact on quality of life and survival of these patients.”

Birmingham leads the way in delivery of a new advanced therapy in uveal melanoma

Written by Louise Stanley on . Posted in Cancer outcomes, Experimental medicine.

BHP founder-member University Hospitals Birmingham is the first site in the UK to treat a uveal melanoma patient with the new therapy Tebentafusp outside a clinical trial. Uveal melanoma is a rare cancer situated within the eye. This initiative is being led by Dr Leila Khoja, Immunotherapy lead for the Birmingham Experimental Cancer Medicine Centre (ECMC) and senior clinical lecturer at another of BHP’s founder members, the University of Birmingham.

Developed by Immunocore PLC, Tebentafusp is a bispecific immunotherapy drug, a type of advanced therapy. Immunotherapies harness the body’s immune system to fight cancer, helping it to attack it and to prevent tumours from growing. However, in some tumours the immune response is inadequate to control the tumour and, even in tumours that respond, resistance to treatment can develop. Tebentafusp’s mechanism of action enables it to attach to the tumour and simultaneously to T-cell immune cells. This means that it is able to pull in and activate tumour specific T-cells in hard to treat tumours.

Birmingham participated in the phase II study of Tebentafusp, and the results were published in Clinical Cancer Research. This led to a phase III trial, where it was shown to offer patients better outcomes in terms of survival, when compared with standard drugs offered by their clinical teams.  It is the first drug of this type for a solid tumour that has been proven to offer this benefit to patients. Regulatory approval for Tebentafusp is in process, but the drug is currently available through a compassionate use programme.

Transferring Tebentafusp into standard clinical care for patients with solid tumours is challenging, as specialist pharmacy, nursing and junior doctor skills are required. Hospitals also need to have sufficient capacity to deliver infusions of the drug on an inpatient basis, as the dose is increased over a three week period, before it can be provided on an outpatient basis. The development of this programme will create a model for similar therapies in the future, and Birmingham ECMC is currently facilitating the setup of clinical trials in this field.

These initiatives underline the importance of the Birmingham ECMC and Midlands Wales Advanced Therapy Treatment Centre (MW-ATTC) networks in supporting the delivery of the innovative therapies of the future, training staff and providing the infrastructure required.

Scientists discover new pathway that prevents bowel cancer treatment from working

Written by Louise Stanley on . Posted in Cancer outcomes, Experimental medicine.

Leading scientists at BHP founder-member the University of Birmingham have discovered a previously unknown pathway that prevents specific drugs from working in patients with bowel cancer.

The research findings pave the way for increasing the number of bowel cancer patients who can be successfully treated, say the scientists.

Bowel cancer, also called colorectal cancer, affects the large bowel, which is made up of the colon and rectum. It is the fourth most common cancer in the UK, with over 42,000 people diagnosed with bowel cancer every year in the UK. It is also the second biggest cancer killer, with 16,000 people with bowel cancer dying in the UK every year.

The University of Birmingham-led research involved the study of 184 tumour samples and medical records of bowel cancer patients participating in the COIN trial, as well as research carried out in mice, cell cultures, and a laboratory model for pre-malignant colorectal cancer.

Co-senior author Andrew Beggs, Professor of Cancer Genetics & Surgery at the University of Birmingham, explained: “About 60% of bowel cancers are sensitive to drugs called anti-EGFR inhibitors which work by blocking a key pathway in these cancers.

“However, despite this, in cancers that should be sensitive to them, these drugs only work in patients about 50% of the time.”

Co-senior author Dr Fedor Berditchevski, also of the University of Birmingham, added: “Scientists have previously found that if bowel cancer patients have a mutation in a gene called RAS, the anti-EGFR inhibitors will not work.

“However, our research has now discovered a new pathway involving a tetraspanin protein called TSPAN6 that is frequently inactive in bowel cancer patients and this makes these drugs less effective. Crucially, our research also shows that if this pathway is active in a patient’s cancer then the drug will work, irrespective of whether they have a mutation in RAS or not.”

First author Dr Regina Andrijes, a Postdoctoral Fellow at the University of Birmingham, concludes: “This is the first time a tetraspanin protein has been shown to be directly involved with bowel cancer. Our research findings show that this new pathway could act as a biomarker for treatment with anti-EGFR drugs in bowel cancer, increasing a patient’s chance of survival and the number of patients who could benefit from these drugs who previously would not have.”

The researchers are now set to undertake a clinical trial of using this marker to better identify patients for anti-EGFR treatment.

The study, published in the Proceedings of the National Academy of Sciences (PNAS), was carried out in collaboration with fellow BHP member University Hospitals Birmingham NHS Foundation Trust, working with Semmelweis University in Hungary, and Assiut University in Egypt.

World-first trial to assess ‘life-extending’ cannabis-based drug for thousands with aggressive brain tumours

Written by Louise Stanley on . Posted in Cancer outcomes, Clinical trials, Experimental medicine.

BHP founder member the University of Birmingham will co-ordinate a major UK trial to analyse the efficacy of cannabis-based drug Sativex in treating the most aggressive form of brain tumours.

The new phase II trial, to be funded by The Brain Tumour Charity, is to launch at 15 NHS hospitals and follows promising results from a phase I study in 27 patients. The phase II trial will assess whether adding Sativex (an oral spray containing cannabinoids THC and CBD) to chemotherapy could extend life for thousands diagnosed with a recurrent glioblastoma, which currently has an average survival of less than 10 months*.

In a phase I trial in glioblastomas earlier this year**, the drug — already used in treating multiple sclerosis — was found to be tolerable in combination with chemotherapy, with the potential to extend survival.

While the phase I study observed that more patients were alive after one year in the Sativex arm compared to the placebo arm, the study was not sufficiently powered to show survival impact.

The new three-year phase II trial (called ARISTOCRAT), led by Professor Susan Short at the University of Leeds and co-ordinated by the Cancer Research UK Clinical Trials Unit at the University of Birmingham, is due to begin recruiting over 230 patients across all UK nations in early 2022, subject to sufficient funds being raised.

Having seen its income drop by over 25% last year due to the pandemic and been forced to pause its regular research grant funding programme, The Brain Tumour Charity has today launched an appeal to raise the £450,000 needed to open the trial as soon as possible.

Experts hope that, should the trial prove successful, Sativex could represent one of the first additions to NHS treatment for glioblastoma patients since temozolomide chemotherapy in 2007.

Glioblastomas are the most common and most aggressive form of brain cancer, with around 2,200 people diagnosed each year in England alone***. They are usually fast-growing and diffuse, with poorly-defined boundaries and thread-like tendrils that extend into other parts of the brain.

Almost all glioblastomas recur even after intensive treatment including surgery, radiotherapy and chemotherapy, and average survival is just 12-18 months from first diagnosis****.

Over the last decade, there has been significant global interest within both patient and scientific communities about the activity of cannabinoids in brain tumours, with the view that cannabinoid-based products may not only help relieve symptoms but could also have a positive impact on survival.

Several pre-clinical laboratory studies***** have suggested that cannabinoids THC and CBD may reduce brain tumour cell growth and could disrupt the blood supply to tumours – however, to date, clinical evidence that they could treat brain tumours has been limited.

In this new phase II trial, researchers will assess whether adding Sativex to the current standard chemotherapy treatment (temozolomide) could offer extra time to live for adults diagnosed with a recurrence of their glioblastoma after initial treatment.

The trial plans to recruit 232 participants across a minimum of 15 hospitals******: two thirds of the participants will be given temozolomide plus Sativex, while one third will be given temozolomide plus placebo*******.

Sativex, manufactured by GW Pharma, is an oromucosal spray containing 1:1 THC (Delta-9-tetrahydrocannabinol) and CBD (cannabidiol), with the active ingredients being absorbed in the lining of the mouth, either under the tongue or inside the cheek.

Participants will be asked to administer up to 12 sprays per day (or to the maximum dose they can tolerate if fewer than 12) of Sativex or placebo oral sprays. Participants will then undergo regular follow-up including clinical assessment (every four weeks), blood tests, MRI scans (every eight weeks), and they will complete quality of life questionnaires. This will also be one of the first trials to integrate with The Brain Tumour Charity’s app BRIAN.

The trial will measure whether adding Sativex to chemotherapy extends the overall length of patients’ lives (overall survival), delays the progression of their disease (progression-free survival) or improves quality of life.

Professor Pam Kearns, Director of the Cancer Research UK Clinical Trials Unit (CRCTU) at the University of Birmingham, which is co-ordinating the trial, said: “Our mission at the CRCTU is to translate cutting-edge science and research into improved patient care by identifying novel therapies that will save lives. It is vital that trials like this, investigating the role cannabis or the chemicals in it can play treat cancer, are carried out.”

Principal Investigator, Professor Susan Short, Professor of Clinical Oncology and Neuro-Oncology at the University of Leeds, said: “The treatment of glioblastomas remains extremely challenging. Even with surgery, radiotherapy and chemotherapy, nearly all of these brain tumours re-grow within a year, and unfortunately there are very few options for patients once this occurs.

“Cannabinoids have well-described effects in the brain and there has been a lot of interest in their use across different cancers for a long time now. Glioblastoma brain tumours have been shown to have receptors to cannabinoids on their cell surfaces, and laboratory studies on glioblastoma cells have shown these drugs may slow tumour growth and work particularly well when used with temozolomide.

“It’s really exciting that we’re now at the point where we can run a definitive, well-designed study that will tell us the answer to whether these agents could help treat the most aggressive form of brain tumour. Having recently shown that a specific cannabinoid combination given by oral spray could be safely added to temozolomide chemotherapy, we’re really excited to build on these findings to assess whether this drug could help glioblastoma patients live longer in a major randomised trial.”

Dr David Jenkinson, Interim CEO at The Brain Tumour Charity, which is funding the trial, said: “We hope this trial could pave the way for a long-awaited new lifeline that could help offer glioblastoma patients precious extra months to live and make memories with their loved ones.

“With so few treatments available and average survival still so heartbreakingly short, thousands affected by a glioblastoma in the UK each year are in urgent need of new options and new hope.

“We know there is significant interest among our community about the potential activity of cannabinoids in treating glioblastomas, and we’re really excited that this world-first trial here in the UK could help accelerate these answers. The recent early-stage findings were really promising and we now look forward to understanding whether adding Sativex to chemotherapy could help offer life-extension and improved quality of life, which would be a major step forward in our ability to treat this devastating disease.

“But we also know that for many, this trial won’t come soon enough. In the meantime, while other cannabis-based products may help alleviate symptoms, there is insufficient evidence to recommend their use to help treat brain tumours. For anyone considering using cannabis-based products or other complementary therapies, it’s vital that you discuss these with your medical team first, as they could interact with other treatments such as anti-epileptic medicines or steroids.”

Stephen Lee, 62 from Leyland in Lancashire, took part in the phase I trial of Sativex in 2015 after his glioblastoma returned following initial treatment. Stephen was first diagnosed in 2010, just a few months after he had very sadly lost his older brother to the same disease. Stephen said: “My diagnosis was very sudden and was one of those days you never forget. Having had to leave work early with a severe headache and a stabbing pain in my right eye, my wife insisted that we go straight to hospital after what my brother had experienced.

“I was admitted that same day, had a scan and that’s when they identified it was a brain tumour. I had the operation the following week, and beforehand my wife and I agreed that we wanted to stay positive, to keep living our lives and to enjoy however much time we had together.

“I joined the early trial of Sativex in the hope that it could improve my quality of life, but I also thought it was important to do so as the chemotherapy and radiotherapy I was having had all been trialled by other people before it could be used safely. I thought it only right and proper that I followed in their footsteps and joined a trial to help prove a new drug which could benefit so many people in the future with a recurring glioblastoma.

“I took the oral spray 10 times a day, and it was easy as I could take it wherever we were going, even while out for dinner. While I don’t know whether I had Sativex or the placebo, since the trial finished in 2016, all my MRI scans have been clear.

“This new trial is so important as it will give people hope that there could be life beyond a glioblastoma diagnosis and that there are other treatments being trialled to support them to live their lives.”
Anyone affected by a glioblastoma can speak to The Brain Tumour Charity on 0808 800 0004.

References:

*Twelves et al. A phase 1b randomised, placebo-controlled trial of nabiximols cannabinoid oromucosal spray with temozolomide in patients with recurrent glioblastoma. Br J Cancer 124, 1379–1387 (2021).

**The initial phase 1b trial, led by the same authors, was published in the British Journal of Cancer in February 2021. The study assessed the safety and potential effectiveness of adding Sativex to temozolomide for patients with a newly recurrent glioblastoma (GBM) – finding it could be tolerated, did not appear to interfere with temozolomide treatment and had the potential to improve survival. In the first part of the study, 6 patients received a personalised regime of Sativex of up to 12 sprays per day, alongside their temozolomide therapy – and the side-effects were recorded and reviewed. In the second part of the study, 21 patients were randomised to receive either Sativex with temozolomide (12 patients) or placebo with temozolomide (9 patients) for a total duration of 12 months. 10 out of 12 (83.3%) patients receiving Sativex were still alive after one year, compared to 4 out of 9 (44.4%) patients in the placebo arm.

***Greenberg et al. Incidence and outcomes for cerebral glioblastoma in England, Public Health England; Brodbelt, A., Greenberg, D., Winters, T., Williams, M., Vernon, S. and Collins, V.P. Glioblastoma in England: 2007–2011. Eur. J. Cancer 2015, 51, 533–542.

****The prior figure (‘less than 10 months’) is the average survival from the point of tumour recurrence following initial treatment, whereas the ‘12-18 months’ figure is the average survival from first diagnosis.

****Rocha et al. Systematic review of the literature on clinical and experimental trials on the antitumor effects of cannabinoids in gliomas. J Neurooncol, 2014. 116(1): p. 11-24; Dumitru, C.A., I.E. Sandalcioglu, and M. Karsak, Cannabinoids in Glioblastoma Therapy: New Applications for Old Drugs. Front Mol Neurosci, 2018. 11: p. 159; Torres, S., et al., A combined preclinical therapy of cannabinoids and temozolomide against glioma. Mol Cancer Ther, 2011. 10(1): p. 90-103.

******The recruiting centres include: Leeds General Infirmary; Guy’s and St Thomas’, London; Queen Elizabeth Hospital, Birmingham; Addenbrooke’s Hospital, Cambridge; Western General Hospital, Edinburgh; The Beatson, Glasgow; The Clatterbridge Cancer Centre, Liverpool; The Christie, Manchester; Queen’s Medical Centre, Nottingham; John Radcliffe Hospital, Oxford; Southampton General Hospital; Southmead Hospital, Bristol; Charing Cross Hospital, London; Velindre Cancer Centre, Cardiff, and the Royal Victoria Hospital, Belfast.

*******Both Sativex and the placebo are being provided free-of-charge for the duration of the trial by GW Pharma.